Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26527
Title: | The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419 | Authors: | MASSARI, DAVIDE Posti, L. Helmi, A. FIORENTINO, Giuliana Tolstoy, E. |
Issue Date: | 2017 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 598 | First Page: | L9 | Abstract: | Aims: We present the first measurement of the proper motion and orbit of the very distant and intriguing globular cluster NCG 2419. Methods: We have combined data from HST and Gaia DR1 to derive the relative proper motions of stars in the direction of the cluster. To tie these to an absolute reference frame, we have used a background galaxy located in the field. Results: We find the absolute proper motion of NGC 2419 to be (μ<SUB>α</SUB>cos(δ), μ<SUB>δ</SUB>) = (-0.17 ± 0.26,-0.49 ± 0.17) mas yr<SUP>-1</SUP>. We have integrated the orbit of the cluster in a Galactic potential and found it to oscillate between 53 kpc and 98 kpc on an almost polar orbit. This, and the fact that it shares the same sense of rotation around the Milky Way, make it very likely that NGC 2419 is a former cluster of the Sagittarius dwarf spheroidal galaxy. | URI: | http://hdl.handle.net/20.500.12386/26527 | URL: | https://www.aanda.org/articles/aa/abs/2017/02/aa30174-16/aa30174-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201630174 | Bibcode ADS: | 2017A&A...598L...9M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
aa30174-16.pdf | PDF editoriale | 856.92 kB | Adobe PDF | View/Open |
Page view(s)
74
checked on Feb 18, 2025
Download(s)
19
checked on Feb 18, 2025
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.